WO2006046712A1

WO2006046712A1 - Foldable portable radio

Info

Publication number: WO2006046712A1
Application number: PCT/JP2005/019926
Authority: WO
Inventors: Akito Sakamoto; Hideo Nakanishi; Masao Kobayashi; Masanori Kikuchi
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-10-28
Filing date: 2005-10-28
Publication date: 2006-05-04
Also published as: JP4948177B2; EP1739785A1; US20070164913A1; JPWO2006046712A1; CN1957504B; US7456794B2; EP1739785A4; CN1957504A

Abstract

In a foldable portable radio configured by connecting two cases to be freely opened and closed, high antenna characteristics are ensured over a wide band by a simple structure. The foldable portable radio is provided with the first case; an antenna element provided on the first case; the second case; a hinge part turnably connecting the first case and the second case; a circuit board provided in the second case with a ground pattern; and a power supply part connected to a radio circuit on the circuit board. The hinge part is made of a nonconductive resin and is provided with a rotating shaft made of a conductive metal for turnable support. The rotating shaft is spatially coupled with the antenna element at a prescribed interval, is arranged with the ground pattern on the circuit board at a prescribed interval, and is electrically connected with the power supply part. The antenna element, the rotating shaft and the ground pattern on the circuit board operate as antenna.

Description

Specification

Foldable portable radio

Technical field

The present invention relates to a foldable portable radio device having high antenna performance over a wide band.

Background art

[0002] In recent years, mobile phones, which are a type of mobile radio device, are widely used. Various types of mobile phone devices have been developed. Among them, when not in use, a compact folding type is widely used in which the upper and lower cases are folded to improve portability. In this foldable portable wireless device, miniaturization and multi-function are progressing, and as one of the multi-functions in recent years, antennas are being built in to improve design.

[0003] As one example, a flexible cable is connected to a shield box in the upper case as disclosed in JP-A-2002-335180 to directly excite the upper shield box, There is a foldable portable radio with a structure that operates as a dipole antenna with a ground pattern, which is a conductor pattern on the circuit board having the ground potential of the lower housing, as a radiating element. According to this configuration, since the effective area of the antenna can be increased, it is possible to obtain a wide band and high gain antenna performance.

Disclosure of the invention

Problems to be solved by the invention

However, in such an antenna configuration, a feeder such as a flexible cable is required as a feeder for the shield box that operates as a radiating element. However, it is desired to design a portable wireless device having a simpler structure and high antenna performance due to the recent downsizing, light weight, and low cost of portable wireless devices.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a foldable portable wireless device having high antenna performance over a wide band with a simple structure.

Means for solving the problem

[0006] The foldable portable radio of the present invention includes a first casing and an antenna element provided in the first casing. A circuit having a ground pattern and a power feeding portion provided in the second housing, a hinge portion that rotatably couples the first housing, the second housing, the first housing, and the second housing A substrate. Here, the hinge portion includes a rotating shaft made of a conductive metal that rotatably connects the first housing and the second housing, and the rotating shaft is provided in the second housing. The antenna element is spatially coupled to the antenna element at a predetermined distance, and the rotation shaft is disposed in the hinge part in a state of being separated from the ground pattern on the circuit board, and is electrically connected to the power feeding part. It has been done. When power is supplied, the antenna acts as a ground pattern force antenna on the circuit board.

[0007] The rotating shaft and the antenna element may be connected via an impedance element that is not spatially coupled.

[0008] The antenna element can be constituted by a circuit board having a conductive plate or a ground pattern constituting a part of the first casing.

[0009] The total length including the rotation axis from the feeding point has an electrical length of approximately a quarter wavelength of a predetermined frequency.

It is desirable to configure the antenna element so that it has an electrical length of approximately one-half wavelength of a predetermined frequency.

[0010] It is desirable that the conductive plate is configured such that each surface of the conductive plate faces the metal portion of the rotating shaft at a predetermined interval.

The invention's effect

[0011] An object of the present invention is to provide a foldable portable radio having a high antenna performance over a wide band with a simple structure.

Brief Description of Drawings

FIG. 1 is a front view showing an external configuration of a folding portable wireless device according to an embodiment of the present invention.

FIG. 2 is a rear view showing the main configuration of the folding portable wireless device according to the first embodiment in an opened state.

FIG. 3 is a side view showing the main configuration of the folding portable wireless device according to the first embodiment in an opened state.

FIG. 4 is a rear view showing the main configuration of the folding portable wireless device according to the second embodiment in an opened state. [5] Side view showing the main configuration of the folding portable wireless device according to the second embodiment in an opened state

[Fig. 6] Experimental results of the folding portable radio device according to the embodiment of the present invention.

[7] Rear view showing the main configuration of the folding portable wireless device according to the third embodiment in an opened state

圆 8] Side view showing the configuration of the main part in the state in which the folding portable wireless device according to the third embodiment is opened.

[9] Rear view showing the main configuration of the folding portable wireless device according to the fourth embodiment in an opened state

圆 10] Side view showing the main configuration of the folding portable wireless device according to the fourth embodiment in the opened state

Explanation of symbols

1 First enclosure

2 Second enclosure

3 Hinge part

4 Kano Kuichi

5 Upper case

6 Display section

7 Resino

8 Lower cover

9 Lower case

10 Operation unit

11 Microphone

12 First circuit board

13 Second circuit board

14 Connection line

15 Rotation axis

16 Feed point 17 Conductive plate

18 Impedance element

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] (First embodiment)

As shown in FIG. 1, the portable wireless device according to the first embodiment of the present invention is, for example, non-conductive.

It has a first case 1 and a second case 2 made of ABS resin, and the first case 1 and the second case

2 and 2 are configured such that both housings can be opened and closed by a hinge portion 3 made of, for example, ABS grease.

[0016] The first housing 1 includes an upper cover 4 and an upper case 5, and is provided with a display unit 6 including a liquid crystal display device, a receiver 7, and the like. The second housing 2 includes a lower cover 8 and a lower case 9, and is provided with an operation unit 10, a microphone 11, etc. having a plurality of operation key buttons, and a radio circuit, a control circuit, an information processing circuit, etc. It has.

FIG. 2 is a rear view schematically showing the main components in the first embodiment, and shows the positional relationship between a circuit board, a rotating shaft, and the like. A first circuit board 12 is housed in the first housing 1 and a second circuit board 13 is housed in the second housing 2, and the first circuit board 12 and the second circuit board 13 are housed in the first housing 1. They are electrically connected by flexible connecting wires 14. In addition, a hinge part 3 is configured so that the first casing 1 and the second casing 2 can be opened and closed. The hinge part outer body constituting the outer surface of the hinge part 3 is the first casing. The body 1 and Z or the second housing 2 are made of non-conductive ABS grease. A rotating shaft 15 made of conductive metal is disposed inside the hinge body, and has a cylindrical structure with a diameter of 7.5 mm and a length of 24 Omm, for example. is doing.

[0018] Here, the first casing 1 and the second casing 2 have a size of, for example, a length of about 100 mm and a width of about 50 mm, respectively. The first circuit board 12 and the second circuit board 13 are composed of, for example, a printed circuit board having a thickness of 1 mm, and the dimensions of the first circuit board 12 are, for example, 65 mm long and 40 mm wide. The substrate 13 is 55 mm long and 40 mm wide.

[0019] One end of the rotating shaft 15 is electrically connected to a feeding point (feeding unit) 16 of the second circuit board 13. It is. Then, for example, a conductive plate 17 made of copper foil having a width of 45 mm and a length of 70 mm is arranged inside the upper case 5 and arranged at a predetermined interval from the rotating shaft 15. Yes. In this case, at the portion where the conductive plate 17 and the rotating shaft 15 overlap, the shape of the conductive plate 17 is bent so that it can face and face the rotating shaft 15 having a circular cross section (cylindrical shape). It is desirable to make it a shape. With such a configuration, the conductive plate 17 and the rotary shaft 15 face each other and are capacitively coupled during power feeding. In addition, as shown in FIG. 2, the rotating shaft 15 is arranged on the hinge portion 3 in a state where the ground pattern force on the second circuit board 13 is also separated (maintaining the distance h).

[0020] The foldable portable radio apparatus according to the present embodiment is assumed to have, for example, a GSM (Global System for Mobile Communications) type mobile phone system in the vicinity of 900 MHz, 1800 MHz, and 1900 MHz. Of course, the folding portable wireless device of the present invention can be applied under other communication systems and other frequencies by changing design conditions.

[0021] In the portable wireless device of the first embodiment configured as described above, at the time of power feeding, the rotating shaft 15 and the ground pattern of the second circuit board 13 are set, for example, to have a resonance frequency around 2000 MHz. Operates as a λ Ζ 4 system monopole antenna. In that case, the total length from the feeding point 16 to the rotating shaft 15 is 2000 MHz and has an electrical length of about 1Z4 wavelength.

In addition, the conductive plate 17 is spatially capacitively coupled to a 1 Z4 wavelength monopole antenna formed by the ground pattern of the rotating shaft 15 and the second circuit board 13 during power feeding, thereby providing a conductive plate. 17, the rotating shaft 15, and the ground pattern of the second circuit board 13 operate as, for example, a λZ2 dipole antenna set at a resonance frequency of about 900 MHz. In that case, the length of the conductive plate 17 in the longitudinal direction has an electrical length of about 1Z2 wavelength of 900 MHz. Therefore, the conductive plate 17 constitutes an antenna element. Spatial coupling between the rotating shaft 15 and the conductive plate 17 means that the two conductors of the rotating shaft 15 and the conductive plate 17 behave like an integrated capacitor when feeding power at a specified frequency. Say. Further, if such an arrangement relationship is established between the rotating shaft 15 and the conductive plate 17 during power feeding, the rotating shaft 15 is spatially spaced apart from the conductive plate 17 even when no power is supplied. It is expressed as being combined and singing. FIG. 6 shows the experimental results at that time, with the horizontal axis representing frequency (MHz) and the vertical axis representing VSWR (Voltage Standing Wave Ratio). In FIG. 6, let oc be the characteristic when only the rotating shaft 15 and the second circuit board 13 are arranged without arranging the first circuit board 12. Further, the characteristic when the rotating shaft 15, the second circuit board 13, and the conductive plate 17 are arranged is indicated by j8. The rotating shaft 15 and the conductive plate 17 are capacitively coupled with a predetermined distance therebetween. As a result of this experimental result, it is possible to satisfy VSWR 3 over a wide band by the antenna structure of the present invention. In addition, when the rotary shaft 15 and the conductive plate 17 are not capacitively coupled at a predetermined interval but are connected in a direct current, the characteristic of γ in FIG. 6 is obtained, compared to the case of capacitive coupling. ◎

[0024] As described above, in the portable wireless device according to the first embodiment, the function of allowing the rotary shaft 15 to open and close the upper and lower housings and the function of the antenna element are shared, and the conductive plate 17 is determined. It has the structure which carried out capacitive coupling at intervals. This makes it possible to obtain good antenna characteristics over a wide band with a simple structure.

[0025] It should be noted that, if the conductive plate 17 is made of a conductive material, the same effect can be obtained even if a material with a deviation is used.

Note that the shape of the conductive plate 17 may be formed over the entire surface as in the present embodiment, or may have a configuration in which a hole is formed in the central portion for component placement for a sub LCD, for example.

Note that the conductive plate 17 may be configured to contact the ground of the first circuit board 12.

In the present embodiment, the conductive plate 17 is configured inside the upper case 5, but the arrangement position of the conductive plate 17 is not particularly limited.

[0029] It should be noted that the capacitance value is optimized according to physical structural conditions such as the area and the distance between the rotating shaft 15 and the conductive plate 17 facing each other, thereby obtaining good antenna characteristics over a wide band. It becomes possible.

[0030] In the portable wireless device of the present invention, the same effect can be obtained even if the rotating shaft 15 is conductive, even if it does not have a cylindrical structure as in the present embodiment. [0031] As described above, the foldable portable wireless device according to the present embodiment feeds power to the antenna element of the upper casing, unlike the conventional configuration in which the entire casing is operated as a dipole antenna. This makes it possible to configure an antenna without the need for power supply means such as flexible cables. In other words, the conductive rotating shaft 15 capable of opening and closing the upper and lower housings operates as a λ Ζ4 system monopole antenna, and the conductive plate 17 and the rotating shaft 15 are capacitively coupled, so that The ground pattern on the circuit board 13 of 2 operates as a λ / 2 dipole antenna. In other words, these interactions ensure good antenna performance over a wide band.

With this configuration, the antenna structure can be simplified, the manufacturing cost and the mounting area can be reduced, and the size and weight can be reduced.

[0033] (Second Embodiment)

4 and 5 are a rear view and a side view showing a foldable portable wireless device according to a second embodiment of the present invention. 4 and FIG. 5, the same reference numerals as those shown in FIG. 2 and FIG. 3 denote the same components, and the detailed description thereof is omitted.

In the folding portable wireless device of the present embodiment shown in FIGS. 4 and 5, the first housing 1 and the second housing 2 are connected by the hinge portion 3, and the rotating shaft 15 The structure that can be opened and closed is the same as in FIGS. 2 and 3 of the first embodiment. The rotary shaft 15 has an impedance element 18 such as a capacitor mounted on the first circuit board 12 with one side surface at one end thereof electrically connected to 16 of the second circuit board 13 and the other side surface at the one end thereof. It is capacitively connected to the conductive plate 17 via With such a structure, the conductive plate 17 and the rotating shaft 15 are capacitively coupled during power feeding.

Thus, as in the first embodiment, the conductive rotating shaft 15 capable of opening and closing the upper and lower housings operates as a λ の 4 system monopole antenna, and the conductive plate 17 and the rotating shaft 15 are connected to each other. By capacitively coupling with the impedance element 18, the conductive plate 17, the rotating shaft 15, and the ground pattern of the second circuit board 13 operate as a λΖ2 system dipole antenna. In other words, these interactions ensure good antenna performance over a wide band.

[0036] (Third embodiment) 7 and 8 are a rear view and a side view showing a foldable portable wireless device according to a third embodiment of the present invention. 7 and 8, the same reference numerals as those shown in FIGS. 2 and 3 denote the same components, and the detailed description thereof is omitted.

In the foldable portable wireless device of the present embodiment shown in FIGS. 7 and 8, the first housing 1 and the second housing 2 are connected by the hinge portion 3, and the rotating shaft 15 The structure that can be opened and closed is the same as in FIGS. 2 and 3 of the first embodiment.

In the present embodiment, the antenna element is configured by the ground pattern of the first circuit board 12. One end of the rotating shaft 15 is electrically connected to the feeding point 16 of the second circuit board 13. The ground pattern of the first circuit board 12 is arranged at a predetermined distance from the rotating shaft 15.

It should be noted that the ground pattern as the antenna element may be formed in the inner layer of the first circuit board 12 by using a multilayer board that may be formed on either the front or back surface of the first circuit board 12.

It should be noted that the configuration of the ground pattern may be formed over the entire surface of the circuit board, or may be a configuration in which a hole is formed in the central portion for component placement for the sub led, for example.

[0041] Thereby, as in the first embodiment, the conductive rotating shaft 15 capable of opening and closing the upper and lower housings operates as a λ / 4 system monopole antenna, and the ground of the first circuit board 12 is The pattern and the rotary shaft 15 are arranged at a predetermined interval and are capacitively coupled, so that the first circuit board 12, the rotary shaft 15, and the ground pattern of the second circuit board 13 are λ 2 systems. Operates as a dipole antenna.

[0042] (Fourth embodiment)

FIG. 9 and FIG. 10 are a rear view and a side view showing a folding portable wireless device according to a fourth embodiment of the present invention. 9 and FIG. 10, the same reference numerals as those shown in FIG. 2 and FIG. 3 denote the same components, and the detailed description thereof will be omitted.

In the foldable portable wireless device of the present embodiment shown in FIGS. 9 and 10, the first housing 1 and the second housing 2 are connected by the hinge portion 3, and the rotating shaft 15 The structure that can be opened and closed is the same as in FIGS. 2 and 3 of the first embodiment.

In the present embodiment, the antenna element is configured by the ground pattern of the first circuit board 12. It is. The rotating shaft 15 has one side surface at one end electrically connected to the feeding point 16 of the second circuit board 13 and the other side surface at the one end connected to the first circuit board via an impedance element 18 such as a capacitor. Connected capacitively!

For example, the capacitance value of the capacitor is about 0.5 pF, and the value varies depending on the structural conditions such as the proximity distance between the rotating shaft 15 and the first circuit board 12, and the value should be optimized. With this, good antenna characteristics can be secured over a wide band.

As a result, as in the first embodiment, the conductive rotating shaft 15 capable of opening and closing the upper and lower housings operates as a λ / 4-system monopole antenna, and the ground of the first circuit board 12 is The ground pattern of the first circuit board 12, the rotary shaft 15, and the second circuit board 13 is reversed by capacitively coupling the pattern and the rotary shaft 15 by the impedance element 18. Works as.

[0047] Although various embodiments of the present invention have been described above, the present invention is not limited to the matters shown in the above-described embodiments, and those skilled in the art can change the modifications based on the description and well-known techniques. · Application is also within the scope of the present invention and is within the scope of protection.

[0048] This application is based on a Japanese patent application filed on October 28, 2004 (Japanese Patent Application No. 2004-314082), the contents of which are incorporated herein by reference.

Industrial applicability

[0049] The present invention can secure antenna performance over a wide band with a simple structure, and is useful for a folding portable radio device configured by connecting two housings so as to be freely opened and closed.

Claims

The scope of the claims

[1] a first housing;

An antenna element provided in the first housing;

A second housing;

A hinge portion that rotatably connects the first housing and the second housing, and a circuit board provided in the second housing and having a ground pattern and a power feeding portion,

The hinge portion includes a rotating shaft made of a conductive metal that rotatably connects the first housing and the second housing,

The rotating shaft is spatially coupled to the antenna element at a predetermined interval, and the rotating shaft is disposed on the hinge portion in a state of being separated from a ground pattern on the circuit board, and the power feeding portion Is electrically connected to the

A foldable portable radio device in which the antenna element, the rotating shaft, and a ground pattern on the circuit board operate as an antenna during power feeding.

[2] a first housing;

An antenna element provided in the first housing;

A second housing;

The hinge portion includes a rotation shaft made of a conductive metal that rotatably connects the first housing and the second housing;

The rotating shaft is connected to the antenna element via an impedance element, and the rotating shaft is disposed in the hinge portion in a state of being separated from a ground pattern on the circuit board and electrically connected to the power feeding portion. Connected to

[3] The portable wireless device according to claim 1 or 2,

The foldable portable wireless device, wherein the antenna element is one of a conductive plate or a circuit board having a ground pattern constituting a part of the first casing.

[4] The foldable portable radio device according to claim 1, wherein the foldable portable radio device according to claim 1,

The total length including the rotation axis from the power feeding unit has an electrical length of approximately a quarter wavelength of a predetermined frequency, and the antenna element has an electrical length of approximately a half wavelength of the predetermined frequency. Tatami portable radio.

[5] The foldable portable radio device according to any one of claims 1, 3 and 4,

A foldable portable wireless device capable of adjusting antenna characteristics by a change in a distance and an area between surfaces of the conductive plate and the rotating shaft facing each other.